Parathyroid hormone deficiency after total thyroidectomy: incidence and time

Area of Science:

• Endocrinology
• Surgical Complications
• Thyroid Surgery Outcomes

Background:

• Parathyroid hormone (PTH) deficiency is a known complication after total thyroidectomy, potentially leading to hypocalcemia.
• Long-term outcomes for patients with post-thyroidectomy hypoparathyroidism are not well-documented.
• This study aimed to assess the incidence and recovery time course of PTH deficiency following total thyroidectomy.

Purpose of the Study:

• To determine the incidence of parathyroid hormone (PTH) deficiency after total thyroidectomy.
• To evaluate the time course of PTH level recovery in deficient patients.
• To identify the long-term need for calcium and vitamin D supplementation.

Main Methods:

• A cohort of 271 patients undergoing total thyroidectomy was studied.
• Serum PTH levels were measured 4 hours and the morning after surgery to diagnose PTH deficiency (<10 pg/mL).
• Outcomes, including PTH levels and supplementation use, were compared between PTH-deficient and non-deficient groups.

Main Results:

• 12% (33 of 271) of patients developed PTH deficiency.
• 73% of deficient patients recovered PTH levels within 1 week; 82% recovered long-term.
• Less than 1% (2 of 271) required long-term 1,25-dihydroxycholecalciferol for hypocalcemia.

Conclusions:

• Approximately 12% of patients experience PTH deficiency post-thyroidectomy.
• The majority of these patients recover parathyroid function within a week, with most achieving long-term recovery.
• Severe, long-term hypocalcemia requiring active vitamin D supplementation is rare.